How can I override Core Symfony2 Classes?

Question

I want to override a core Symfony2 Class.

Specifically I want to override vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Templating/TemplateReference.php, th

Answer 1

You can easily override some classes defined as service (you can check on app/cache/dev/appDevDebugProejctContainer.xml), and override the service name on your parameter.ini.

BUT if the class it not defined like this, you can create your own "patch" you apply after a composer update.

Lot of people will say its dirty to edit core classes, but if you want good performance, its often the only solution to achieve it ;-), its simple, fast & easy.

Other solutions are welcome ..

Answer 2

Do not do this, unless you know exactly what you're doing, and you're 100% sure you won't break something ...

If you're using the Symfony 2.0 ClassLoader component:

$loader->registerNamespaces(array(
    'Symfony' => array(
        __DIR__.'/../src/vendor/symfony/src',
        __DIR__.'/../vendor/symfony/src',
        __DIR__.'/../vendor/bundles',
    ),
    ...
));

To do this with composer, this should work, edit your composer.json file:

"autoload": {
    "psr-0": {
         "": "src/",
         "Symfony": "src/vendor/symfony/src/"
    }
},

This tells the autoloader, that when it tries to load a class from the Symfony namespace, to first look in your src/vendor/symfony/src, then in vendor/symfony/src then in vendor/bundles ...

And then duplicate the file you want to edit there:

src/vendor/symfony/src/Symfony/Bundle/FrameworkBundle/Templating/TemplateReference.php